Solidity Sample: Separation of Rules & Logic from Data Structure

SoliditySampleDivideLogicFromData.sol

contract ManagableAuthorization{
//Simplified in a way that all readers can read all data. In real case scenario you will have more complex logic.
    mapping(address => bool) readers; 
    modifier canRead(){
        //your logic for example:
        require(readers[msg.sender]);
        _;
    }
    //........ the rest of the class code.........
}
contract PeopleRepository is ManagableAuthorization{
    
    struct Person {
        bytes32 name;
        uint birthDate;
    }
    mapping(address => Person) people;
    
    function readPerson(address personAddress) public canRead returns(bytes32, uint) {
        Person storage person = people[personAddress];
        return(person.name, person.birthDate);
    }
    //........ the rest of the class code.........
}